\documentclass[11pt]{article}
\usepackage{tikz}
\usepackage{pgffor}
\usetikzlibrary{shapes}
\usetikzlibrary{arrows}
\usetikzlibrary{trees}
\usetikzlibrary{patterns}

\begin{document}

\begin{figure}
\begin{center}

\begin{tikzpicture}[scale=1.0]

%Draw legend
\draw (3.25, 4.5) rectangle ++ (3.5, 4.75);
\draw (3.75, 5) node[right] {BJ Last};
\draw (3.75, 5.75) node[right] {BJ Middle};
\draw (3.75, 6.5) node[right] {BJ First};
\draw (3.75, 7.25) node[right] {MG Last};
\draw (3.75, 8) node[right] {MG Middle};
\draw (3.75, 8.75) node[right] {MG First};

\draw (3.6, 5) node {$\triangle$};
\draw (3.6, 5.75) node {$\diamond$};
\draw (3.6, 6.5) node {$\times$};
\draw (3.6, 7.25) node {$\circ$};
\draw (3.6, 8) node {$\bullet$};
\draw (3.6, 8.75) node {$\star$};

\end{tikzpicture} 

\end{center}
\end{figure}

\end{document}
			